Posted by **sam** on Tuesday, October 19, 2010 at 3:54am.

A ball is project from the building of height 250m, at angle 45degree below the horizontal with a speed of 25m/s.

i) how long does the ball remain in the air?

ii) find the magnitude and direction of the velocity of the ball just before it strikes the ground. (g=9.81m/s2)

- physics -
**drwls**, Tuesday, October 19, 2010 at 8:56am
i) Twice the time it takes for the vertical component to become zero.

T = 2*V*sin45/g

ii) The horizontal V component remains constant at Vcos 45 and the vertical component V sin 45 changes sign, but has the same magnitude at the ground, since kinetic energy is the same there.

## Answer this Question

## Related Questions

- Physics - A ball is tossed from an upper-story window of a building. The ball is...
- physics - A boy standing on top of a building throws a small ball from a height ...
- Physics urgent pls! - A ball is tossed from an upper-storey window of a building...
- physics - A)A ball is tossed from an upper-story window of a building. The ball ...
- Physics - A ball is tossed from an upper-story window of a building. The ball ...
- physic - Hi! Question:A ball is tossed from an upper-story window of a building....
- Physics - A boy throws a ball with an initial speed of 40.0 m/s. The angle of ...
- physics - A soccer ball is kicked into the air at an angle of 38 degrees above ...
- physics - a soccer ball is kicked into the air at an angle of 38 degrees above ...
- physics - a soccer ball is kicked into the air at an angle of 38 degrees above ...

More Related Questions